Remove flac from Cobalt builds

[osagie98]

No description provided.

[github-actions]

🤖 Gemini Suggested Commit Message

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media: Remove FLAC from Cobalt builds

Exclude FLAC audio handling and its associated third-party dependency
from Cobalt builds. This reduction in scope helps minimize the binary
size and build complexity for Cobalt, as FLAC support is not required
for its target platforms.

Bug: 10790

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